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  1. /*
  2.  * Copyright (C) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup mips32mm   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef __mips32_TLB_H__
  36. #define __mips32_TLB_H__
  37.  
  38. #include <arch/exception.h>
  39. #include <typedefs.h>
  40.  
  41. #ifdef TLBCNT
  42. #   define TLB_ENTRY_COUNT      TLBCNT
  43. #else
  44. #   define TLB_ENTRY_COUNT      48
  45. #endif
  46.  
  47. #define TLB_WIRED       1
  48. #define TLB_KSTACK_WIRED_INDEX  0
  49.  
  50. #define TLB_PAGE_MASK_16K   (0x3<<13)
  51.  
  52. #define PAGE_UNCACHED           2
  53. #define PAGE_CACHEABLE_EXC_WRITE    5
  54.  
  55. typedef union entry_lo entry_lo_t;
  56. typedef union entry_hi entry_hi_t;
  57. typedef union page_mask page_mask_t;
  58. typedef union index tlb_index_t;
  59.  
  60. union entry_lo {
  61.     struct {
  62. #ifdef BIG_ENDIAN
  63.         unsigned : 2;       /* zero */
  64.         unsigned pfn : 24;  /* frame number */
  65.         unsigned c : 3;     /* cache coherency attribute */
  66.         unsigned d : 1;     /* dirty/write-protect bit */
  67.         unsigned v : 1;     /* valid bit */
  68.         unsigned g : 1;     /* global bit */
  69. #else
  70.         unsigned g : 1;     /* global bit */
  71.         unsigned v : 1;     /* valid bit */
  72.         unsigned d : 1;     /* dirty/write-protect bit */
  73.         unsigned c : 3;     /* cache coherency attribute */
  74.         unsigned pfn : 24;  /* frame number */
  75.         unsigned : 2;       /* zero */
  76. #endif
  77.     } __attribute__ ((packed));
  78.     uint32_t value;
  79. };
  80.  
  81. /** Page Table Entry. */
  82. struct pte {
  83.     unsigned g : 1;         /**< Global bit. */
  84.     unsigned p : 1;         /**< Present bit. */
  85.     unsigned d : 1;         /**< Dirty bit. */
  86.     unsigned cacheable : 1;     /**< Cacheable bit. */
  87.     unsigned : 1;           /**< Unused. */
  88.     unsigned soft_valid : 1;    /**< Valid content even if not present. */
  89.     unsigned pfn : 24;      /**< Physical frame number. */
  90.     unsigned w : 1;         /**< Page writable bit. */
  91.     unsigned a : 1;         /**< Accessed bit. */
  92. };
  93.  
  94. union entry_hi {
  95.     struct {
  96. #ifdef BIG_ENDIAN
  97.         unsigned vpn2 : 19;
  98.         unsigned : 5;
  99.         unsigned asid : 8;
  100. #else
  101.         unsigned asid : 8;
  102.         unsigned : 5;
  103.         unsigned vpn2 : 19;
  104. #endif
  105.     } __attribute__ ((packed));
  106.     uint32_t value;
  107. };
  108.  
  109. union page_mask {
  110.     struct {
  111. #ifdef BIG_ENDIAN
  112.         unsigned : 7;
  113.         unsigned mask : 12;
  114.         unsigned : 13;
  115. #else
  116.         unsigned : 13;
  117.         unsigned mask : 12;
  118.         unsigned : 7;
  119. #endif
  120.     } __attribute__ ((packed));
  121.     uint32_t value;
  122. };
  123.  
  124. union index {
  125.     struct {
  126. #ifdef BIG_ENDIAN
  127.         unsigned p : 1;
  128.         unsigned : 27;
  129.         unsigned index : 4;
  130. #else
  131.         unsigned index : 4;
  132.         unsigned : 27;
  133.         unsigned p : 1;
  134. #endif
  135.     } __attribute__ ((packed));
  136.     uint32_t value;
  137. };
  138.  
  139. /** Probe TLB for Matching Entry
  140.  *
  141.  * Probe TLB for Matching Entry.
  142.  */
  143. static inline void tlbp(void)
  144. {
  145.     __asm__ volatile ("tlbp\n\t");
  146. }
  147.  
  148.  
  149. /** Read Indexed TLB Entry
  150.  *
  151.  * Read Indexed TLB Entry.
  152.  */
  153. static inline void tlbr(void)
  154. {
  155.     __asm__ volatile ("tlbr\n\t");
  156. }
  157.  
  158. /** Write Indexed TLB Entry
  159.  *
  160.  * Write Indexed TLB Entry.
  161.  */
  162. static inline void tlbwi(void)
  163. {
  164.     __asm__ volatile ("tlbwi\n\t");
  165. }
  166.  
  167. /** Write Random TLB Entry
  168.  *
  169.  * Write Random TLB Entry.
  170.  */
  171. static inline void tlbwr(void)
  172. {
  173.     __asm__ volatile ("tlbwr\n\t");
  174. }
  175.  
  176. #define tlb_invalidate(asid)    tlb_invalidate_asid(asid)
  177.  
  178. extern void tlb_invalid(istate_t *istate);
  179. extern void tlb_refill(istate_t *istate);
  180. extern void tlb_modified(istate_t *istate);
  181.  
  182. #endif
  183.  
  184. /** @}
  185.  */
  186.